Read just a portion of a txt file
I want to read a 2D array (matrix) from a text file omitting the very first and last columns. How should I do that?
Thanks
same post?
Regards
Guru (CLA)
Similar Messages
-
Problem on reading and writing from from a *.txt file
I get Problem on reading and writing from from a *.txt file. The following is the read() method...
The software said the DataInputStream is depreciated. Can anyone help me please?
public void read()
File file = new File("C://Documents and Settings//Charles//My Documents//Brunel//EE2065//Assignment and Lab//Assignment 4 and Lab 4//data.txt");
FileInputStream in = null;
String str = "";
try
in = new BufferedReader(file);
//in = new FileInputStream(file);
for(;;)
str = new BufferedReader(in).readLine();
//str = new DataInputStream(in).readLine();
if(str == null)
break;
System.out.print(str);
in.close();
catch(IOException e)
System.err.println("execution error: " +e);
}Thank you for your reply. I have made some change. However, there is an incompetable type found error.
in = new BufferedReader(new InputStreamReader(in));The following are all of the code.
public void read()
File file = new File("C://Documents and Settings//Charles//My Documents//Brunel//EE2065//Assignment and Lab//Assignment 4 and Lab 4//data.txt");
FileInputStream in = null;
//BufferedReader in = null;
String str = "";
try
in = new BufferedReader(new InputStreamReader(in));
//in = new FileInputStream(file);
for(;;)
BufferedReader Bstr = new BufferedReader(new InputStreamReader(in));
//str = new BufferedReader(in).readLine();
//str = new DataInputStream(in).readLine();
if(str == null)
break;
System.out.print(str);
in.close();
catch(IOException e)
System.err.println("execution error: " +e); -
How to read the last line in a txt file?
Dear all,
I want to read the last line in a txt file. There are thousands of lines in this file. What I want is to move the file pointer directly to the last line of the file. But I did not know how do to it. Can anybody help me out?
Thank you very much!If the file is coded as ASCII or one of the encodings that maps a single byte to a char then the following class will assist you
import java.io.*;
import java.util.*;
public class GetLinesFromEndOfFile
static public class BackwardsFileInputStream extends InputStream
public BackwardsFileInputStream(File file) throws IOException
assert (file != null) && file.exists() && file.isFile() && file.canRead();
raf = new RandomAccessFile(file, "r");
currentPositionInFile = raf.length();
currentPositionInBuffer = 0;
public int read() throws IOException
if (currentPositionInFile <= 0)
return -1;
if (--currentPositionInBuffer < 0)
currentPositionInBuffer = buffer.length;
long startOfBlock = currentPositionInFile - buffer.length;
if (startOfBlock < 0)
currentPositionInBuffer = buffer.length + (int)startOfBlock;
startOfBlock = 0;
raf.seek(startOfBlock);
raf.readFully(buffer, 0, currentPositionInBuffer);
return read();
currentPositionInFile--;
return buffer[currentPositionInBuffer];
public void close() throws IOException
raf.close();
private final byte[] buffer = new byte[4096];
private final RandomAccessFile raf;
private long currentPositionInFile;
private int currentPositionInBuffer;
public static List<String> head(File file, int numberOfLinesToRead) throws IOException
return head(file, "ISO-8859-1" , numberOfLinesToRead);
public static List<String> head(File file, String encoding, int numberOfLinesToRead) throws IOException
assert (file != null) && file.exists() && file.isFile() && file.canRead();
assert numberOfLinesToRead > 0;
assert encoding != null;
LinkedList<String> lines = new LinkedList<String>();
BufferedReader reader= new BufferedReader(new InputStreamReader(new FileInputStream(file), encoding));
for (String line = null; (numberOfLinesToRead-- > 0) && (line = reader.readLine()) != null;)
lines.addLast(line);
reader.close();
return lines;
public static List<String> tail(File file, int numberOfLinesToRead) throws IOException
return tail(file, "ISO-8859-1" , numberOfLinesToRead);
public static List<String> tail(File file, String encoding, int numberOfLinesToRead) throws IOException
assert (file != null) && file.exists() && file.isFile() && file.canRead();
assert numberOfLinesToRead > 0;
assert (encoding != null) && encoding.matches("(?i)(iso-8859|ascii|us-ascii).*");
LinkedList<String> lines = new LinkedList<String>();
BufferedReader reader= new BufferedReader(new InputStreamReader(new BackwardsFileInputStream(file), encoding));
for (String line = null; (numberOfLinesToRead-- > 0) && (line = reader.readLine()) != null;)
// Reverse the order of the characters in the string
char[] chars = line.toCharArray();
for (int j = 0, k = chars.length - 1; j < k ; j++, k--)
char temp = chars[j];
chars[j] = chars[k];
chars[k]= temp;
lines.addFirst(new String(chars));
reader.close();
return lines;
public static void main(String[] args)
try
File file = new File("/usr/share/dict/words");
int n = 10;
System.out.println("Head of " + file);
int index = 0;
for (String line : head(file, n))
System.out.println(++index + "\t[" + line + "]");
System.out.println("Tail of " + file);
int index = 0;
for (String line : tail(file, "us-ascii", n))
System.out.println(++index + "\t[" + line + "]");
catch (Exception e)
e.printStackTrace();
}Note, the EOL characters are treated as line separators so you will probably need to read the last two lines (think about it for a bit). -
How to read the second line in a .txt file with bufferedReader?
hi,
i am not the best in speaking english and programming java :)
so, just try to make sense of my question:
Im using a BufferedReader to read a .txt file.
the .txt file has 5+ different lines, and each line has 6 tokens (separated with ; )
My java file has 6 textFields and each textfield is filled with one of the 6 different tokens.
and my problem is:
I want my buffered reader to read the next line (with 6 new different tokens) by pressing a button.
if somethings not understandable, just ask :)maybe its easier to help me, when i publish my code, so here it is:
(its my version, without Thof's code. Sorry, but the comments are the most in german)
/* userdata.java */
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
public class userdata extends Frame {
//-----------------------------------KlassenVariablen------------------------------------------------
private JPanel panel = new JPanel ();
String tokId = "";
String tokName= "";
String tokAge= "";
String tokTel= "";
String tokMail= "";
String tokText= "";
BufferedReader br;
String zeile;
StringTokenizer st;
String delim = ";";
//---------Buttons f?r Panel 1-------------------------
Button first = new Button("|< First");
Button back = new Button("< Back");
Button next = new Button("Next >");
Button last = new Button("Last >|");
//---------Buttons f?r Panel 3-------------------------
Button neu = new Button("New");
Button safe = new Button("Safe");
Button refresh = new Button("Refresh");
//--------Labels f?r Panel 2-----------------------------
Label lid = new Label("ID",Label.LEFT);
Label lname = new Label("Name",Label.LEFT);
Label lage = new Label("Age",Label.LEFT);
Label ltel = new Label("Tel.",Label.LEFT);
Label lmail = new Label("E-Mail",Label.LEFT);
Label ltext = new Label("Spruch",Label.LEFT);
Label lub = new Label("Last Button",Label.LEFT);
TextField id = new TextField();
TextField name = new TextField();
TextField age = new TextField();
TextField tel = new TextField();
TextField mail = new TextField();
TextField text = new TextField();
TextField usedbutton = new TextField();
//--------ActionEvent bla sachen eben--------------------
public static void main (String[] args) throws IOException {
userdata wnd = new userdata();
wnd.setVisible(true);
public userdata() throws IOException {
//--------------------------------Layout mit panel bestimmung--------------------------------------
setLayout(new BorderLayout());
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
add(BorderLayout.NORTH ,p1);
add(BorderLayout.CENTER , p2);
add(BorderLayout.SOUTH , p3);
//-------------------------------Funktionslose Buttons in PANEL 1------------------------------------
p1.add(first);
p1.add(back);
p1.add(next);
p1.add(last);
p1.add(usedbutton);
//--------------------------------Funktionierende Textfelder in PANEL 2------------------------------
Panel labelpanel = new Panel();
p2.setLayout(new GridLayout(7,3));
p2.add(lid);
p2.add(id);
p2.add(lname);
p2.add(name);
p2.add(lage);
p2.add(age);
p2.add(ltel);
p2.add(tel);
p2.add(lmail);
p2.add(mail);
p2.add(ltext);
p2.add(text);
p2.add(lub);
p2.add(usedbutton);
//--------------------------------------Buttons in PANEL 3-----------------------------------------
p3.add(neu);
p3.add(safe);
p3.add(refresh);
//--------------------------------BufferedReader -------------------------------------------------
readData();
//--------------------------------Panel 2 TextField-----------------------------------------------
fillForm();
//================================ActionPerformed==================================================
first.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed( ActionEvent e ) {
System.out.println ("First");
usedbutton.setText("First");
back.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed( ActionEvent e ) {
System.out.println ("Back");
usedbutton.setText("Back");
next.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed( ActionEvent e ) {
System.out.println ("Next");
usedbutton.setText("Next");
last.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed( ActionEvent e ) {
System.out.println ("Last");
usedbutton.setText("Last");
neu.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed( ActionEvent e ) {
System.out.println ("New entry");
usedbutton.setText("New");
safe.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed( ActionEvent e ) {
System.out.println ("Now Saving, do not turn off!");
usedbutton.setText("Save");
//-----------------refresh
refresh.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed( ActionEvent e ) {
try{
readData();
}catch( IOException ioe){
System.out.println("Fehler beim lesen aus Datei");
fillForm();
usedbutton.setText("Refresh");
//=============================================================================Button Funktionen!!!
pack();
//--------------------------------WindowsListener hinzuf?gene--------------------------------------
addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent event)
setVisible(false);
dispose();
System.exit(0);
//-----------------------------------readData() - > Buffered Reader in aktion! --------------------
private void readData() throws IOException{
BufferedReader br = new BufferedReader(new FileReader("My .txt File with path"));
String zeile;
StringTokenizer st;
String delim = ";";
zeile = br.readLine();
st = new StringTokenizer(zeile, delim);
st.hasMoreTokens();
//System.out.println (st.nextToken());
tokId = new String(st.nextToken());
tokName = new String (st.nextToken());
tokAge = new String (st.nextToken());
tokTel = new String (st.nextToken());
tokMail = new String (st.nextToken());
tokText = new String (st.nextToken());
//--------------------------fillForm() - > f?llt die TextFelder aus!--------------------------------
private void fillForm(){
id.setText(tokId);
name.setText(tokName);
age.setText(tokAge);
tel.setText(tokTel);
mail.setText(tokMail);
text.setText(tokText);
} -
I can't read in a date from a txt file
Im not sure of the code needed to read in a date from the text file, this is an example of the text file:
1
2
2003
ie,
day
month year
I have to read in this date, this is the set method for the date:
public void setPurchaseDate (int d, int m, int y)
new Date(d,m,y);
And this is the code that I have tried using to readin the date:
PurchaseDate=(Integer.parseInt(line),Integer.parseInt(line),Integer.parseInt(line));now i know its wrong, I just dont know what the code should be!!
Cheersok, I am going to go through it and see what values I can and cant read in, here is the code i am trying to use:
private void addx()
FileReader fin;
int noBooks;
int itemNum;
String title;
String subject;
double costNew;
double costPaid;
String isbn;
double sellingPrice = 0;
int noAuthors;
int day;
int month;
int year;
String seperator = "#";
Book[] book = new Book[9];
try
fin = new FileReader("Books.txt");
BufferedReader buff = new BufferedReader(fin);
String line = buff.readLine();
int count= 0;
//read in Number of books
noBooks=Integer.parseInt(line);
while( line != null)
//Read in item number
itemNum = Integer.parseInt(line);
//Read in title
title = buff.readLine();
//Read in number of authors
noAuthors=Integer.parseInt(line);
//Read each line in as an author until number of authors reached
ArrayList authors = new ArrayList();
for(int i=0; i < noAuthors ; i++)
authors.add(buff.readLine());
//Read in cost new
costNew = Double.parseDouble(line);
//Read in subject
subject = buff.readLine();
//Read in ISBN
isbn = buff.readLine();
//Read in purchase day
day = Integer.parseInt(line);
//Read in purchase month
month=Integer.parseInt (line);
//Read in purchase year
year = Integer.parseInt (line);
//Read in cost paid
costPaid = Double.parseDouble(line);
line = buff.readLine();
//Pass date, month and year values to array
Date purchaseDate =new Date(day,month,year);
//Pass values to constructor
if (line.equals(seperator))
book[count++] = new Book(itemNum, title, authors, subject, purchaseDate,costNew,costPaid,isbn, sellingPrice,noAuthors);
// line = buff.readLine();
System.out.println(book.toString());
catch(Exception ex)
System.out.println(ex.toString());
} -
Read until a certain point in txt file
I need to know how to read in until a '|' how do i do this? (in a txt file)
get your file input stream and just read char at a time until u reach the |
while(in.readChar() != '|' ){
// do nothing
[\code] -
Read at each new line from .txt file
Hi guys
I want to read from a file which I am saving using labview. What I am doing is reading 128 bytes fro VISA port and saving it in .txt file with new line constant. At some later time I want to read 128 bytes from that text file do some processing and display it. The "read from text file" vi has convert EOL but I am not able to configure it. Please help me..
Thanks in advance
NiladriHi Newbee_3,
Do 1 thing, Read the txt file & convert this into string, Then you have all the flexibility to do whatever you want.
Thanks
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet -
Reading Last line(record) from a txt file ina java
Hi,
I want to retrive the last line from a txt file.Can anybody help me??
Thanx in advanceIn order to read the last line you must read all the lines before it. To read lines you can use the BufferedReader and LineNumberReader classes.
Here's an example of how to read lines of text from a file:
http://javaalmanac.com/egs/java.io/ReadLinesFromFile.html -
Buenos días - Good morning
Mi pregunta la escribiré en español y en ingles y espero alguien tenga la solución.
I'll write my question in Spanish and English and I hope someone has the solution.
SPANISH
Creé una Macro en VBA que lee mas de 200.000 archivos de texto (.txt) los cuales tienen diferentes tamaños y cantidad de información dentro de ellos, de cada archivo necesito extraer la información de las 3 primeras lineas y las ultimas 10 lineas, las 3
primeras lineas es fácil ya que uso un "READLINE" 3 veces y voy capturando la información de las tres primeras lineas, para las ultimas 10 lineas las cuales están identificadas por un código inicial hago un ciclo que lee linea por linea hasta que
encuentra el numero 3 en un espacio especificado de la linea y de ahí captura la información de cada linea de texto que serian las 10 ultimas, el problema que tengo es que la cantidad de archivos y de información dentro de los archivos aumenta considerablemente
cada día y por tener el ciclo que lee cada una de las lineas de cada archivo de texto la Macro se demora cada vez mas a medida que aumenta la información y consume cada vez mas memoria de la maquina.
Necesito un método diferente que no lea linea por linea y que yo le pueda decir lea la linea (renglón) numero 1000 (ejemplo) y capture la información a partir de ahí para ahorrar algo de tiempo, o saber cuantas lineas de texto tiene el archivo .txt y decirle
que me lea a partir de (numero total de lineas del txt -(menos) 10 lineas) así me leería las 10 ultimas.
ENGLISH
I created a Macro in VBA that reads more than 200,000 text files (.txt) which have different sizes and quantity of information within them, each file need to extract the information from the first 3 lines and last 10 lines, 3 first lines is easy as using a
'READLINE "3 times and am capturing information from the first three lines, for the last 10 lines which are identified by an initial code I make a loop that reads line by line until it finds the number 3 in a specified area of the line and then capture
the information of each line of text that would be 10 last, the problem that I have is that the number of files and information within files significantly increases every day and having the loop that reads each line of each text file is delayed Macro increasingly
as more information and consume more and more memory on the machine.
I Need a different method not read line by line and I can tell you read the line (row) number 1000 (example) and capture the information from there to save some time or know how many lines of text have the file .txt and tell me read from (total number of lines
of txt - (minus) 10 lines) so I would read 10 last.
Here is the code I currently use
Dejo el código que uso actualmente
Dim fs, f, ts, REG
Set fso = CreateObject("Scripting.FileSystemObject")
On Error Resume Next
sFilePath = strFolder & "\" & strFileName
Set f = fso.getFile(sFilePath)
Set ts = f.OpenAsTextStream(1, 0)
REG = ts.READLINE
Ciclo para llegar hasta las ultimas 10 lineas
Cycle to reach the last 10 lines
For J = 1 To 200000
REG = ts.READLINE
If Val(Mid(REG, 6, 1)) = 3 ThenGood Morning ryguy72
First thank you so much for your answer, sorry for my english in the question, I tried for a long time to make a code that wasn't so slow to read the last 10 lines, 'cuz most codes used a cycle "For" to read line by line asking if in the specific
position is the character(number) that tells me that i should get started to read the last lines that i need, that takes a lot longer than your code doing a Split with Mydata and storing it in strData(). I don't know how to do this and every forum that
i consulted to read the last 10 lines quickly they made the same read line by line with a Cycle "for".
Thanks again, I gonna improve my code with your help, 'cuz it took about 4 hours to read all the information and everyday ascended more time and memory consumption.
Thanks to everyone who offered their help so disinterested and free, so should always be people with that spirit, I hope someday to be SO good as you programming. -
How read just a part of a binary file?
I want to read only a part of a big binary file.
I have made a piece of labview code that works well, but every time I try to read only a part of the file, I have an error.
I try to search where I have make a mistake in the code, but dont find.
Just for information : at the end of the code, I just display 1 data of 5.
Thanks in advance.
Attachments:
LECTURE-ZOOM.vi 66 KBJohnsold.
Thank you for your answer.
I have tested you vi LECTURE-ZOOM.2.vi, and I think there is some problems with my application.
First, let me transduce the vi into words : if columns index is more than the max columns value, then you stop, and the same think with the rows index.
With the sift register you make a memory allocation for the array that changes every loop.
By doing this way, I have two problem.
When I read a big file, the memory allocation takes a lot of memory, because the array allocation in memory changes every loop.
Besides, when I run the vi, the columns and rows are completly wrong, because, the command "chanel number is not respected : if I put 7 chanels, I have 5 chanels on the array.
Then, When I have it, I compare the "sortie" array versus "entrée" array, and I seems that AFTER decimation (1 point taken on 5), I have more points at the end than at the begining.
I give you a sample of a data file (compressed in zip...) to test your vi.
It's a 6 chanels data file, puted in a array.
When I try to run the vi you modify for me, I seems that it doexn't work because the result was totaly wrong... :-(
I think that I make a mistake/error in the vi understanding, because I try to change some parts of your vi, to adapt it to my application, but it doesn't work.
What do you think about my way of read the datas?
How can I change the vi to obtain the same array than in mine.
To see what I obtain, just lunch the vi in my next post with the data file in this post.
Attachments:
buffer01.zip 1201 KB -
FCC: Receiver: Just one element filled -- create txt-File
Hi everybody,
we got a message-interface with just one element <content>texttexttexttext</content>
We want to use FCC to create a text-File.
How do the parameters have to look?
regards MarioHi,
go through this blog and do FCC as per your data.
/people/arpit.seth/blog/2005/06/02/file-receiver-with-content-conversion
I think it will be better if you could send the exect data, which you are gona to create a text file by using Receiver FCC. There should be some separation in between the text, otherwise how u will decide the fieldSeparator in FCC.
Regards,
Sarvesh -
Reading .txt files and put it into a TextArea
Hi all,
I got a problem! I have to make something like a messenger.
I want to put the written text into a .txt file, after that I have to get the text out of the .txt file and put in into a TextArea.
I would ike it to to that like this:
">User 1
Hello!
>User 2
Hi!
Now here are my questions:
1: What is the moet easy way to do this ?
2: How could i put Enters into a .txt file with Java ?
3: How could i read all the text from the .txt file and put it into a TextArea WITH ENTERS ?
Thanks for your help!
Greetings, Jasper Kouwenberguse JTextArea.read(new FileReader(fileName)) for reading.
and JTextArea.write(new FileWriter(fileName)) for writing.
The enters should be ok if the user press enter and adds a new line ("\n") to the text area component.
It will save the enter in the text file and load it correctly back to the text area.
If you want to add enter programmatically just add "\n" string to the text area component. -
[CS3 JS] Reading TXT file content into String
Hello,
I'm currently wanting to display a dialog box that has a dropdown menu containing all countries of the world.
I have an external txt file that contains a list of all countries.
I thought I would simply read-in the contents of the 'txt' file into a string and use it for displaying the list.
For example
i Instead of the usual:
> var myLandMenu = dropdowns.add({stringList:["A", "B"...], selectedIndex:0});
i I thought of doing something like:
> var myLandList = ....? HELP ?....
> var myLandMenu = dropdowns.add({stringList:myLandList, selectedIndex:0});
Is this the way to do it?
What would be the way to read in the text file content as a string?
Thanks in advance,
Lee> var myLandList = ....? HELP ?....
> var myLandMenu = dropdowns.add({stringList:myLandList, selectedIndex:0});
It's hard to tell from context, but myLandList needs to be an array of strings.
If the file has one element per line, this would be one way of handling the
conversion:
var file = File("~/countries.txt");
file.open("r");
var str = file.read();
file.close();
var myLandList = str.split(/[\r\n]+/);
And assuming that this is ScriptUI and not the older ID UI, the menu creation
would look more like:
var myLandMenu = dropdowns.add(bounds, myLandList);
myLandMenu.items[0].selected = true;
-X
for photoshop scripting solutions of all sorts
contact: [email protected] -
How to get a txt file output of Bookmarks or Annotations
I just tried to get a txt file report for the bookmarks. but its not working.
var root = this.bookmarkRoot;
var Report = new Report();
PrintBookmark(Report, root, 0);
Report.save("/c/temp/newreport.txt");
function PrintBookmark(Report, Bm, nLevel)
Report.writeText(Bm.name);
if (Bm.children != null)
for (var i = 0; i < Bm.children.length; i++)
PrintBookmark(Report, Bm.children[i], nLevel + 1);
This is the result i got in console.
NotAllowedError: Security settings prevent access to this property or method.
Report.save:5:Batch undefined:Exec
Whats wrong i did?First of all, a Report is a PDF that you can generate with JavaScript, not a text file. It might be better to create a text data object (doc.createDataObject), which you can then export (doc.exportDataObject).
Edit: corrected mistake -
Read .txt file of numbers and draw
Hello.
I am trying to utlize BufferedReader and g.drawline to read numbers from a text file and output to the screen as a "line".
I know I still need a while loop and some error checking, but, am having trouble finishing the more 'basic' portion of the code.
The GUI class is already taken care of. I am just trying to open the file, read, turn to int, produce lines, then close file.
I have commented out some of the code that was provided with the assignment.
Any help would be appreciated.
Thank you.
import javax.swing.*;
import java.awt.*;
* DrawingPanel creates a panel used for drawing
* a map
* Numbers stored in text file, usa.txt.
* one number per line. Read each number
* create a map on screen. GUI provided in a
* 2nd class.
public class DrawingPanel extends JPanel {
/** Graphics object used for drawing on the panel */
private Graphics g;
/** Tells if it is time to draw */
private boolean timeToDrawPath;
/** The filename of the hurricane path */
//private String pathFile;
private String usa.txt;
* Creates a new, white DrawingPanel for drawing the maps
public DrawingPanel() {
setBackground(Color.white);
this.timeToDrawPath = false;
//this.pathFile = null;
this.usa.txt = null;
* This method is called automatically by Java. There will NEVER
* be a direct call to paint() anywhere in the code. Anytime that we
* need to update what is drawn on the screen, we call repaint().
* @param grph The graphics window to paint
public void paint(Graphics grph) {
g = grph;
super.paint(g);
processUSA();
if (timeToDrawPath){
drawPath();
* Reads the USA coastline coordinates from a file and draws the path
* to the panel
public void processUSA( ) {
//just an example of how to draw a single
//line segment from (50,50) to (200,200)
//g.drawLine( 300, 50, 200, 200);
//Insert the while loop here??
//Include the parse.Int statement
//Open the file
String inFile = ("usa.txt");
FileReader fileReader = new FileReader (inFile);
//BufferedReader bufReader = newBufferedReader (fileReader);
BufferedReader bufReader=newBufferedReader (new fileReader ("usa.txt"));
//Insert beginning of while loop here????
//read data from the file
String str=bufReader.readLine();
g.drawLine(x1,y1,x2,y2);
}Yep, you are right in deciding the positioning of the while loop.
But the folly you are committing is while creating object of BufferedReader ... It is to be created by passing to the constructor, the reference of the FileReader object you have created.
so the line of code shud look like ...
BufferedReader bufReader = new BufferedReader(FileReaderObject);
And then you can go ahead with readLine() as per your requirement in the while loop.
Maybe you are looking for
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